Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd72a37210557c14…

MALICIOUS

PDF

71.8 KB Created: 2020-12-23 02:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 87c6c5960afa7c290b14436ab144ce29 SHA-1: 9bf64726921d75ac273ccfb07c017a769210cff2 SHA-256: cd72a37210557c145c20e6513d905fa554e4c954340e8f566b7b96cf3a5eed11
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/123?utm_term=osrs+elemental+workshop+2+quick+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fd38d0a5b56c.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/xusofim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kefodek/kajetedefalizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1d6c2d-0889-47f2-9f0c-9450fc8edc4c/11013507903.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7d305fcdb718a17c69c1/t/5fdd044467c3114891d62eb1/1608320068759/todebugaberobalude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd84b7f6-0926-4b2d-aa8a-9009d9200f32/1794871759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30315d5-fe16-4a1a-86c1-cacc803edaed/97274884644.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdffc93c02f22b9dd3a892/1606287305899/jugofekatuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/felaborejevagave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b815345-aa44-4e79-8244-ef39fc0ee579/wuvixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bdf739-7769-4b24-875f-084e56a042d3/steph_curry_powerpoint_nike.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/nvidia_shield_tv_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 5808 bytes
SHA-256: d05994fe9b242ff96c56487a3ec46117020a4a21e01d7221b99a271a68c6ff55
font_01_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 10324 bytes
SHA-256: 485823ce1835e1e0831364c43292e49873255c14e2ea52ef64a7c03a1fb6218f
font_02_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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